The Use of Holographic Phase Shifting in Assessing Unbonds in GRP Plates

[+] Author and Article Information
C. C. Soh, H. M. Shang, F. S. Chau

Department of Mechanical and Production Engineering, National University of Singapore, Kent Ridge, Singapore 0511

Y. Y. Hung

School of Engineering and Computer Science, Oakland University, Rochester, MI

J. Eng. Mater. Technol 116(4), 545-549 (Oct 01, 1994) (5 pages) doi:10.1115/1.2904326 History: Received May 19, 1993; Revised December 22, 1993; Online April 29, 2008


During holographic inspection of glass fiber reinforcesd plastic (GRP) laminated plates, perturbation in the fringe patterns not only reveals the presence of an unbond but also enables estimation of its depth. The accuracy of estimation depends, among other factors, on the accuracy in determining the fringe orders within the boundary of perturbation. This study shows that phase shifting using a single reference beam enables determination of fractional fringe orders at any point on the test surface. When applied to the assessment of the detected unbond, this simple technique gives a more accurate estimation of the unbond depth than conventional holography.

Copyright © 1994 by The American Society of Mechanical Engineers
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